273????

Hell_Fish said

I sleeved the cylinders in my block instead of over sized pistons, used 85' 318 swirlport heads and now can use any intake I want. The only thing you have to do to convert from a solid lifter cam to a hyd. is swap the cam and lifters and buy longer pushrods. You can reuse the adjustable rockers.

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I was going to use the 1985 318 swirl port heads on my 273 too, they are easy to find in the junk yard and have the same valve size as the 273. The casting number ends in 302. Its a closed chamber head and then you can use flat top pistons to get a good quench, its also very efficient (compared to 273 heads) and you can use any modern 318 manifold. I was planning on using an older LD4 manifold from Edelbrock I see them on Ebay every so often.